Rainbow Electronics MAX13256 - Manual (Page 5)

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MAX13256
36V H-Bridge Transformer
Driver for Isolated Supplies
Typical Operating Characteristics
(V
DD
= 24V, T
A
= +25NC, unless otherwise noted.)
SUPPLY CURRENT
vs. EXTERNAL CLOCK FREQUENCY
MAX13256 toc01
EXTERNAL CLOCK FREQUENCY (kHz)
I DD
(mA)
1700 1400 1100 800 500
1
2
3
4
5
6
7
8
9
10
0
200 2000
NO LOAD
NORMALIZED CURRENT-LIMIT
THRESHOLD vs. TEMPERATURE
I LIM
0.92
0.94
0.96
0.98
1.02
1.04
1.06
1.08
1.10
0.90
MAX13256 toc04
1.00
110 95 80 65 50 35 20 5 -10 -25 -40 125
T A (°C)
ST1/ST2 SWITCHING FREQUENCY
vs. TEMPERATURE
MAX13256 toc02
T A (°C)
f SW
(kHz)
110 95 80 65 50 35 20 5 -10 -25
400
350
450
500
550
600
300
-40 125
CLK = GND
ST1/ST2 OUTPUT-VOLTAGE LOW
vs. SINK CURRENT
MAX13256 toc05
V
OL
(mV)
600
500
400
300
200
100
0
I SINK (mA)
100 200 300 400 500 600 700 0 800
CURRENT-LIMIT THRESHOLD
vs. R LIM
MAX13256 toc03
R LIM (I)
I LIM
(mA)
2600 2200 1800 1400
200
300
400
500
600
700
100
1000 3000
ST1/ST2 OUTPUT-VOLTAGE HIGH
vs. SOURCE CURRENT
MAX13256 toc06
I SOURCE (mA)
V OH
(V)
700 600 400 500 200 300 100
23.2
23.3
23.4
23.5
23.6
23.7
23.8
23.9
24.0
24.1
23.1
0 800
MAX13256 toc07
V OL
(mV)
50
100
150
200
250
300
350
400
0
I SINK (mA)
8 6 4 2 0 10
FAULT OUTPUT-VOLTAGE LOW
vs. SINK CURRENT
ISOLATED OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX13256 toc08
I LOAD (mA)
400 300 200 100 0 500
V
OUT
(V)
21
22
23
24
25
26
27
28
29
30
20
V
DD
= 24V
1:1 TRANSFORMER
FULL-WAVE RECTIFIER
NO SNUBBER